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javascript - Firebase DB - How to update particular value of child in Firebase Database

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javascript - Firebase DB - How to update particular value of child in Firebase Database

I want to update my display name in the code below. How can I update displayName?

My database structure is:

-Users
      -KUanJA9egwmPsJCxXpv

         displayName:"Test Trainer"

         email:"test@gmail.com"

         uid: "jRXMsNZHR2exqifnR2rXcceEMxF2"
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